Fix remote branch fetching and revision lookup in update.sh

This patch changes to:

- add `--no-single-branch` to git clone to ensure all remote branches
  are tracked, allowing the script to switch between OpenBSD versions.

- use origin/ prefix for $openbsd_branch to fix revision lookup
  At initial setup, the branch only exists as a "remote-tracking"
  reference. Since a local branch hasn't been created yet, git cannot
  find it by name alone. Adding the origin/ prefix explicitly tells
  git to look into the remote data we just fetched.

This ensures the script can correctly identify the commit hash based
on the release timestamp even on a fresh shallow clone.

Fix https://github.com/libressl/portable/issues/1233

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